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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 8
 1
 4
 2

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 31.1 Ω
 15.1 Ω
 15.9 Ω
 31.9 Ω

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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 2%
 4%
 25%
 5%

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 field current control
 supply voltage control
 armature circuit resistance control
All of these

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Electrical Machines
Dynamic braking is employed to brake

 non reversing drive
 both 1 and 2
 reversing drive
None of these

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  less heating of the rotor.
  negative sequence current.
  all of these.
  less heating of the rotor.

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